Physics · Current Electricity
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A 60-watt, 110-volt tungsten filament lamp is operated on 120 volts, which of the following statements regarding the lamp is (are)true?
I. It will consume more than 60 watts while operating
II. It will have a lower resistance than at 110 volts.
lll. It will be brighter than at 110 volts.
IV. It will burn out after operating 1/2 hour or less.
- A
l,ll.and lll only
- B
l and lll only
- C
ll and lV only
- D
iV only
- E
None of the above
Statement 1: A 60 W 110 V tungsten filament lamp will consume more than 60 W while operating on 120 V.
This is because the power consumed by a filament lamp is proportional to the square of the voltage applied. So, if the voltage is increased by 10%, the power consumed will increase by 21%.
Statement 2: A 60 W 110 V tungsten filament lamp will have a lower resistance than 110 V when operated on 120 V.
This is not true. The resistance of a tungsten filament lamp is a function of its temperature, not the voltage applied. So, the resistance of the lamp will remain the same even if the voltage is increased.
Statement 3: A 60 W 110 V tungsten filament lamp will be brighter when operated on 120 V than when operated on 110 V.
This is true. Because the power consumed by the lamp is increased, the temperature of the filament will increase, and the lamp will emit more light.
Statement 4: A 60 W 110 V tungsten filament lamp will burn out after operating for half an hour if it is operated on 120 V.
Statement 1: A 60 W 110 V tungsten filament lamp will consume more than 60 W while operating on 120 V.
This is because the power consumed by a filament lamp is proportional to the square of the voltage applied. So, if the voltage is increased by 10%, the power consumed will increase by 21%.
Statement 2: A 60 W 110 V tungsten filament lamp will have a lower resistance than 110 V when operated on 120 V.
This is not true. The resistance of a tungsten filament lamp is a function of its temperature, not the voltage applied. So, the resistance of the lamp will remain the same even if the voltage is increased.
Statement 3: A 60 W 110 V tungsten filament lamp will be brighter when operated on 120 V than when operated on 110 V.
This is true. Because the power consumed by the lamp is increased, the temperature of the filament will increase, and the lamp will emit more light.
Statement 4: A 60 W 110 V tungsten filament lamp will burn out after operating for half an hour if it is operated on 120 V.
Statement 1: A 60 W 110 V tungsten filament lamp will consume more than 60 W while operating on 120 V.
This is because the power consumed by a filament lamp is proportional to the square of the voltage applied. So, if the voltage is increased by 10%, the power consumed will increase by 21%.
Statement 2: A 60 W 110 V tungsten filament lamp will have a lower resistance than 110 V when operated on 120 V.
This is not true. The resistance of a tungsten filament lamp is a function of its temperature, not the voltage applied. So, the resistance of the lamp will remain the same even if the voltage is increased.
Statement 3: A 60 W 110 V tungsten filament lamp will be brighter when operated on 120 V than when operated on 110 V.
This is true. Because the power consumed by the lamp is increased, the temperature of the filament will increase, and the lamp will emit more light.
Statement 4: A 60 W 110 V tungsten filament lamp will burn out after operating for half an hour if it is operated on 120 V.
Statement 1: A 60 W 110 V tungsten filament lamp will consume more than 60 W while operating on 120 V.
This is because the power consumed by a filament lamp is proportional to the square of the voltage applied. So, if the voltage is increased by 10%, the power consumed will increase by 21%.
Statement 2: A 60 W 110 V tungsten filament lamp will have a lower resistance than 110 V when operated on 120 V.
This is not true. The resistance of a tungsten filament lamp is a function of its temperature, not the voltage applied. So, the resistance of the lamp will remain the same even if the voltage is increased.
Statement 3: A 60 W 110 V tungsten filament lamp will be brighter when operated on 120 V than when operated on 110 V.
This is true. Because the power consumed by the lamp is increased, the temperature of the filament will increase, and the lamp will emit more light.
Statement 4: A 60 W 110 V tungsten filament lamp will burn out after operating for half an hour if it is operated on 120 V.
Statement 1: A 60 W 110 V tungsten filament lamp will consume more than 60 W while operating on 120 V.
This is because the power consumed by a filament lamp is proportional to the square of the voltage applied. So, if the voltage is increased by 10%, the power consumed will increase by 21%.
Statement 2: A 60 W 110 V tungsten filament lamp will have a lower resistance than 110 V when operated on 120 V.
This is not true. The resistance of a tungsten filament lamp is a function of its temperature, not the voltage applied. So, the resistance of the lamp will remain the same even if the voltage is increased.
Statement 3: A 60 W 110 V tungsten filament lamp will be brighter when operated on 120 V than when operated on 110 V.
This is true. Because the power consumed by the lamp is increased, the temperature of the filament will increase, and the lamp will emit more light.
Statement 4: A 60 W 110 V tungsten filament lamp will burn out after operating for half an hour if it is operated on 120 V.
Statement 1: A 60 W 110 V tungsten filament lamp will consume more than 60 W while operating on 120 V.
This is because the power consumed by a filament lamp is proportional to the square of the voltage applied. So, if the voltage is increased by 10%, the power consumed will increase by 21%.
Statement 2: A 60 W 110 V tungsten filament lamp will have a lower resistance than 110 V when operated on 120 V.
This is not true. The resistance of a tungsten filament lamp is a function of its temperature, not the voltage applied. So, the resistance of the lamp will remain the same even if the voltage is increased.
Statement 3: A 60 W 110 V tungsten filament lamp will be brighter when operated on 120 V than when operated on 110 V.
This is true. Because the power consumed by the lamp is increased, the temperature of the filament will increase, and the lamp will emit more light.
Statement 4: A 60 W 110 V tungsten filament lamp will burn out after operating for half an hour if it is operated on 120 V.
Tagged under Physics · Current Electricity · 2011